An object of the present invention is to produce a titanium metal material or a titanium alloy material having a crystalline titanium oxide film formed on the surface. The metal titanium material or titanium alloy material having a crystalline titanium oxide film formed on the surface is useful as a photocatalyst material, photoelectric conversion element material, wear-resistant member, edible oil deterioration prevention member, etc. that exhibits high functionality. Material. A method of manufacturing a metal titanium material or titanium alloy material having a crystalline titanium oxide film formed on a surface thereof, comprising: (1) performing a roughening treatment on the surface of the metal titanium material or titanium alloy material; A step of forming a surface material, (2) a step of forming a titanium compound on the surface of the roughened material obtained in step (1), and (3) a titanium compound on the surface obtained in step (2). The material formed with an anodizing treatment in an electrolyte solution having no etchability with respect to titanium to form an amorphous titanium oxide film, and (4) obtained in the step (3) A material having an amorphous titanium oxide film formed on the surface is at least 300 ° C. in an air atmosphere, at least one atmosphere selected from the group consisting of an oxygen gas and nitrogen gas mixed atmosphere, and an oxygen gas atmosphere Heat treatment at a temperature of Manufacturing method characterized by comprising the steps of forming a titanium film. [Selection figure] None
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